Determination of anisotropy fields in recording media

2000 ◽  
Vol 87 (9) ◽  
pp. 5711-5713 ◽  
Author(s):  
G. R. Jones ◽  
L. S. Prichard ◽  
J. A. Hutchings ◽  
H. Laidler ◽  
K. O'Grady
Keyword(s):  
Recording Media

Determination of local order in the amorphous precursor to Ba-hexaferrite thin-film recording media

1996 ◽  
Vol 79 (8) ◽  
pp. 4890 ◽  
Author(s):  
J. E. Snyder ◽  
V. G. Harris ◽  
B. N. Das ◽  
N. C. Koon ◽  
X. Sui ◽  
...  
Keyword(s):  
Thin Film ◽  
Local Order ◽  
Recording Media ◽  
Amorphous Precursor

Determination of Critical Volumes in Recording Media

1998 ◽  
Vol 517 ◽  
Author(s):  
K. O'Grady ◽  
P. Dova ◽  
H. Laidler
Keyword(s):  
Waiting Time ◽  
Thermal Activation ◽  
Activation Volume ◽  
Recording Media ◽  
Thermal Loss ◽  
Ultrahigh Density

AbstractIn this overview paper the concept of thermal activation of magnetisation reversal is reviewed in terms of the Wohlfarth-Gaunt formalism. This formalism gave rise to the concept of an activation volume of reversal. Other techniques have been developed for the determination of activation or critical volumes of reversal and these are reviewed. It is found that these methods give the same approximate value for the activation volume but the only method based on micromagnetism is the waiting time experiment which is consistent with Gaunt. Factors which affect the activation volume such as incoherent reversal and intergranular coupling are discussed together with measures that may be required in order to generate ultrahigh density recording media that are relatively free from thermal loss of signal.

Determination of easy axis distribution in recording media

1990 ◽  
Vol 26 (1) ◽  
pp. 210-212 ◽  
Author(s):  
M. el-Hilo ◽  
P.E. Kelly ◽  
K. O'Grady ◽  
J. Popplewell
Keyword(s):  
Easy Axis ◽  
Recording Media
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